Climate Change Is 'Our Biggest Threat,' Says Sir David Attenborough Famed naturalist Sir David Attenborough has a grave warning about global warming. He believes climate change could lead to the extinction of "much of the natural world." He gave his remarks during United Nations-sponsored climate talks in
Katowice, Poland. Sir David Attenborough, in remarks at COP24 Sir David Attenborough, in remarks at COP24 UN Secretary-General Antonio Guterres said climate change was a "matter of life and death" for many nations already. The World Bank has pledged $200 billion in funding over five years to support countries fighting against climate change.